{"id":836,"date":"2020-02-19T07:36:12","date_gmt":"2020-02-19T07:36:12","guid":{"rendered":"https:\/\/www.webhozz.com\/code\/?p=836"},"modified":"2020-02-19T07:36:15","modified_gmt":"2020-02-19T07:36:15","slug":"siklus-react-js","status":"publish","type":"post","link":"https:\/\/www.webhozz.com\/code\/siklus-react-js\/","title":{"rendered":"Siklus React JS"},"content":{"rendered":"\n

Siklus <\/strong>Komponen<\/strong><\/strong><\/h4>\n\n\n\n

Setiap komponen dalam React memiliki siklus yang dapat kamu amati dan manipulasi selama tiga fase utamanya.<\/p>\n\n\n\n

Tiga fase tersebut adalah: Mounting<\/strong>, Updating<\/strong>,\nand Unmounting<\/strong>.<\/p>\n\n\n\n

Mounting<\/strong><\/h4>\n\n\n\n

Mounting<\/strong> berarti menempatkan elemen ke dalam DOM.<\/p>\n\n\n\n

React memiliki empat metode bawaan yang dipanggil, dalam urutan ini, saat memasang komponen:<\/p>\n\n\n\n

  1. constructor()<\/li>
  2. getDerivedStateFromProps()<\/li>
  3. render()<\/li>
  4. componentDidMount()<\/li><\/ol>\n\n\n\n

    Metode render () diperlukan dan akan selalu\ndipanggil, yang lain adalah opsional dan akan dipanggil jika kamu\nmendefinisikannya.<\/p>\n\n\n\n

    A.    \n<\/strong> Metode Constructor<\/strong><\/h6>\n\n\n\n

    Metode constructor() dipanggil\nsebelum apa pun, ketika komponen diinisiasi, dan metode constructor() adalah tempat alami untuk mengatur keadaan awal dan\nnilai awal lainnya.<\/p>\n\n\n\n

    Metode constructor() dipanggil dengan props, sebagai argumen, dan kamu harus selalu\nmulai dengan memanggil super(props) sebelum yang lain, ini akan memulai metode\nkonstruktor induk dan memungkinkan komponen mewarisi metode dari induknya (React.Komponen).<\/p>\n\n\n\n

    Contoh:<\/strong><\/p>\n\n\n\n

    Memanggil metode constructor, oleh React, setiap kali kamu membuat komponen:<\/p>\n\n\n

    \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  render() {\n    return (\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
    B.\u00a0\u00a0\u00a0\u00a0 Metode getDerivedStateFromProps<\/strong><\/h6>\n\n\n\n
    Metode getDerivedStateFromProps\n() dipanggil tepat sebelum memberi elemen di DOM.<\/p>\n\n\n\n
    Ini adalah tempat untuk mengatur objek state berdasarkan awal props.<\/p>\n\n\n\n
    Dibutuhkan state sebagai argumen, dan mengembalikan objek dengan perubahan ke state.<\/p>\n\n\n\n
    Contoh di bawah ini dimulai dengan warna favorit\nmenjadi “red”, tetapi metode getDerivedStateFromProps\n() memperbarui warna favorit\nberdasarkan atribut favcol:<\/p>\n\n\n\n
    Contoh<\/strong><\/strong><\/p>\n\n\n\n
    Metode getDerivedStateFromProps\ndipanggil tepat sebelum metode\nrender:<\/p>\n\n\n
    \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  static getDerivedStateFromProps(props, state) {\n    return {favoritecolor: props.favcol };\n  }\n  render() {\n    return (\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n    );\n  }\n}\n\nReactDOM.render(<Header favcol="yellow"\/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
    C.\u00a0\u00a0\u00a0\u00a0 Metode Render<\/strong><\/h6>\n\n\n\n
    Metode render () diperlukan, dan merupakan metode yang sebenarnya\nmenampilkan HTML ke DOM.<\/p>\n\n\n\n
    Contoh<\/strong><\/strong><\/p>\n\n\n\n
    Komponen sederhana dengan metode render () sederhana:<\/p>\n\n\n
    \nclass Header extends React.Component {\n  render() {\n    return (\n      <h1>This is the content of the Header component<\/h1>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
    D.\u00a0\u00a0\u00a0\u00a0 Metode componentDidMount<\/strong><\/h6>\n\n\n\n
    Metode componentDidMount ()\ndipanggil setelah komponen\ndiberikan.<\/p>\n\n\n\n
    Di sinilah kamu menjalankan\npernyataan yang mengharuskan komponen sudah ditempatkan di DOM.<\/p>\n\n\n\n
    Contoh<\/strong><\/strong><\/p>\n\n\n\n
    Pada awalnya warna favorit saya merah, tapi beri\nsaya sebentar, dan itu kuning:<\/p>\n\n\n
    \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  componentDidMount() {\n    setTimeout(() => {\n      this.setState({favoritecolor: "yellow"})\n    }, 1000)\n  }\n  render() {\n    return (\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
    Updating<\/strong><\/h4>\n\n\n\n
    Fase berikutnya\ndalam Lifeclyce adalah komponen Updating.<\/strong><\/p>\n\n\n\n
    Sebuah komponen diperbarui setiap kali ada\nperubahan dalam ini komponen stateatau props.<\/p>\n\n\n\n
    React memiliki lima\nmetode bawaan yang dipanggil, dalam urutan ini, ketika komponen diperbarui:<\/p>\n\n\n\n
    1. getDerivedStateFromProps()<\/li>
    2. shouldComponentUpdate()<\/li>
    3. render()<\/li>
    4. getSnapshotBeforeUpdate()<\/li>
    5. componentDidUpdate()<\/li><\/ol>\n\n\n\n
      Metode render () diperlukan dan akan selalu dipanggil, yang lain\nadalah opsional dan akan dipanggil jika kamu\nmendefinisikannya.<\/p>\n\n\n\n
      A.    \n<\/strong>Metode getDerivedStateFromProps<\/strong><\/h6>\n\n\n\n
      Juga pada update metode getDerivedStateFromProps dipanggil. Ini\nadalah metode pertama yang dipanggil ketika komponen diperbarui.<\/p>\n\n\n\n
      Ini masih merupakan tempat alami untuk mengatur\nobjek negara berdasarkan alat peraga awal.<\/p>\n\n\n\n
      Contoh di bawah ini memiliki tombol yang mengubah\nwarna favorit menjadi biru, tetapi karena metode getDerivedStateFromProps () dipanggil, yang\nmemperbarui status dengan warna dari atribut favcol, warna favorit masih tetap\nberwarna kuning:<\/p>\n\n\n\n
      Contoh<\/strong><\/strong><\/p>\n\n\n\n
      Jika komponen di update, metode getDerivedStateFromProps () dipanggil:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  static getDerivedStateFromProps(props, state) {\n    return {favoritecolor: props.favcol };\n  }\n  changeColor = () => {\n    this.setState({favoritecolor: "blue"});\n  }\n  render() {\n    return (\n      <div>\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n      <button type="button" onClick={this.changeColor}>Change color<\/button>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header favcol="yellow"\/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      B.\u00a0\u00a0\u00a0\u00a0 Metode shouldComponentUpdate<\/strong><\/h6>\n\n\n\n
      Dalam metode shouldComponentUpdate\n() kamu dapat mengembalikan nilai Boolean yang menentukan apakah React harus\nmelanjutkan dengan memberi atau tidak.<\/p>\n\n\n\n
      Nilai standarnya benar.<\/p>\n\n\n\n
      Contoh di bawah ini menunjukkan apa yang terjadi ketika\nmetode shouldComponentUpdate () mengembalikan false:<\/p>\n\n\n\n
      Contoh<\/strong><\/strong><\/p>\n\n\n\n
      Hentikan komponen rendering pada setiap update:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  shouldComponentUpdate() {\n    return false;\n  }\n  changeColor = () => {\n    this.setState({favoritecolor: "blue"});\n  }\n  render() {\n    return (\n      <div>\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n      <button type="button" onClick={this.changeColor}>Change color<\/button>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      Contoh<\/strong><\/strong><\/p>\n\n\n\n
      Contoh yang sama seperti di atas, tetapi kali ini metode shouldComponentUpdate () mengembalikan true sebagai gantinya:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  shouldComponentUpdate() {\n    return true;\n  }\n  changeColor = () => {\n    this.setState({favoritecolor: "blue"});\n  }\n  render() {\n    return (\n      <div>\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n      <button type="button" onClick={this.changeColor}>Change color<\/button>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      C.\u00a0\u00a0\u00a0\u00a0 Metode Render<\/strong><\/h6>\n\n\n\n
      Metode render () tentu saja dipanggil ketika komponen diperbarui, ia\nharus merender ulang HTML ke DOM, dengan perubahan baru.<\/p>\n\n\n\n
      Contoh di bawah ini memiliki tombol yang mengubah\nwarna favorit menjadi biru:<\/p>\n\n\n\n
      Contoh<\/strong><\/strong><\/p>\n\n\n\n
      Klik tombol untuk membuat perubahan dalam status\nkomponen:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  changeColor = () => {\n    this.setState({favoritecolor: "blue"});\n  }\n  render() {\n    return (\n      <div>\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n      <button type="button" onClick={this.changeColor}>Change color<\/button>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      D.\u00a0\u00a0\u00a0\u00a0 Metode getSnapshotBeforeUpdate<\/strong><\/h6>\n\n\n\n
      Dalam metode getSnapshotBeforeUpdate\n() Anda memiliki akses ke alat\nperaga dan menyatakan sebelum pembaruan, yang berarti bahwa bahkan setelah\npembaruan, kamu dapat memeriksa apa nilainya sebelum pembaruan.<\/p>\n\n\n\n
      Jika metode getSnapshotBeforeUpdate\n() hadir, kamu juga harus\nmemasukkan metode componentDidUpdate () , jika tidak,\nAnda akan mendapatkan kesalahan.<\/p>\n\n\n\n
      Contoh di bawah ini mungkin terlihat rumit, tetapi\nyang dilakukannya hanyalah ini:<\/p>\n\n\n\n
      Ketika komponen sedang dipasang itu diberikan dengan warna favorit “merah”.<\/p>\n\n\n\n
      Ketika komponen telah dipasang, timer mengubah status, dan setelah satu detik, warna favorit menjadi “kuning”.<\/p>\n\n\n\n
      Tindakan ini memicu fase pembaruan, dan karena komponen ini memiliki metode getSnapshotBeforeUpdate (), metode ini dijalankan, dan menulis pesan ke elemen DIV1 yang kosong.<\/p>\n\n\n\n
      Kemudian metode componentDidUpdate () dijalankan dan menulis pesan di elemen DIV2 kosong:<\/p>\n\n\n\n
      Contoh<\/strong><\/strong><\/p>\n\n\n\n
      Gunakan metode getSnapshotBeforeUpdate () untuk mengetahui seperti apa objek keadaan sebelum pembaruan:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  componentDidMount() {\n    setTimeout(() => {\n      this.setState({favoritecolor: "yellow"})\n    }, 1000)\n  }\n  getSnapshotBeforeUpdate(prevProps, prevState) {\n    document.getElementById("div1").innerHTML =\n    "Before the update, the favorite was " + prevState.favoritecolor;\n  }\n  componentDidUpdate() {\n    document.getElementById("div2").innerHTML =\n    "The updated favorite is " + this.state.favoritecolor;\n  }\n  render() {\n    return (\n      <div>\n        <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n        <div id="div1"><\/div>\n        <div id="div2"><\/div>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      E.\u00a0\u00a0\u00a0\u00a0 Metode componentDidUpdate<\/strong><\/h6>\n\n\n\n
      Metode componentDidUpdate dipanggil setelah komponen diperbarui di DOM.<\/p>\n\n\n\n
      Contoh di bawah ini mungkin terlihat rumit, tetapi yang dilakukannya hanyalah ini:<\/p>\n\n\n\n
      Ketika komponen sedang dipasang itu diberikan dengan warna favorit “merah”.<\/p>\n\n\n\n
      Ketika komponen telah dipasang, timer mengubah status, dan warnanya menjadi “kuning”.<\/p>\n\n\n\n
      Tindakan ini memicu fase upate, dan karena komponen ini memiliki metode componentDidUpdate, metode ini dijalankan dan menulis pesan dalam elemen DIV kosong:<\/p>\n\n\n\n
      Contoh<\/strong><\/p>\n\n\n\n
      Metode componentDidUpdate dipanggil setelah pembaruan telah diberikan dalam DOM:<\/p>\n\n\n
      \nclass Header extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {favoritecolor: "red"};\n  }\n  componentDidMount() {\n    setTimeout(() => {\n      this.setState({favoritecolor: "yellow"})\n    }, 1000)\n  }\n  componentDidUpdate() {\n    document.getElementById("mydiv").innerHTML =\n    "The updated favorite is " + this.state.favoritecolor;\n  }\n  render() {\n    return (\n      <div>\n      <h1>My Favorite Color is {this.state.favoritecolor}<\/h1>\n      <div id="mydiv"><\/div>\n      <\/div>\n    );\n  }\n}\n\nReactDOM.render(<Header \/>, document.getElementById('root'));\n<\/pre><\/div>\n\n\n
      Unmounting<\/strong><\/h4>\n\n\n\n
      Fase berikutnya dalam siklus adalah ketika komponen dihapus dari DOM, atau unmount karena React suka menyebutnya.<\/p>\n\n\n\n
      React hanya memiliki satu metode bawaan yang dipanggil ketika komponen dilepas:<\/p>\n\n\n\n
      • componentWillUnmount()<\/li><\/ul>\n\n\n\n
        A. Metode componentWillUnmount<\/strong><\/h6>\n\n\n\n
        Metode componentWillUnmount dipanggil ketika komponen akan dihapus dari DOM.<\/p>\n\n\n\n
        Contoh<\/strong><\/strong><\/p>\n\n\n\n
        Klik tombol untuk menghapus tajuk:<\/p>\n\n\n
        \nclass Container extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {show: true};\n  }\n  delHeader = () => {\n    this.setState({show: false});\n  }\n  render() {\n    let myheader;\n    if (this.state.show) {\n      myheader = <Child \/>;\n    };\n    return (\n      <div>\n      {myheader}\n      <button type="button" onClick={this.delHeader}>Delete Header<\/button>\n      <\/div>\n    );\n  }\n}\n\nclass Child extends React.Component {\n  componentWillUnmount() {\n    alert("The component named Header is about to be unmounted.");\n  }\n  render() {\n    return (\n      <h1>Hello World!<\/h1>\n    );\n  }\n}\n\nReactDOM.render(<Container \/>, document.getElementById('root'));\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"
        Siklus Komponen Setiap komponen dalam React memiliki siklus yang dapat kamu amati dan manipulasi selama tiga fase utamanya. Tiga fase tersebut adalah: Mounting, Updating, and Unmounting. Mounting Mounting<\/p>\n","protected":false},"author":1,"featured_media":775,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-836","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-reactjs"],"yoast_head":"\nBelajar Siklus React JS - WebHozz Code<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.webhozz.com\/code\/siklus-react-js\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Belajar Siklus React JS - WebHozz Code\" \/>\n<meta property=\"og:description\" content=\"Siklus Komponen Setiap komponen dalam React memiliki siklus yang dapat kamu amati dan manipulasi selama tiga fase utamanya. 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